Malicious PDF — malware analysis report

Static analysis result for SHA-256 9620dbc52845fb1d…

MALICIOUS

PDF

73.2 KB Created: 2021-03-09 11:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3d05505902c7ab6cf18f82a84eec38d2 SHA-1: 26c818eb07d9c88585870d2c5e565ec9cf6581f3 SHA-256: 9620dbc52845fb1d53d0bd8e10ebac73262c819f018548a2cd43cc8c1d9d5d03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/aws?utm_term=advanced+mathematical+methods+for+scientists+and+engineers+solutions+manual PDF link annotation
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/dotube.pdfIn PDF document text
    • http://psylath.com/how_to_update_garmin_nuvi_30_40_500pq2s.pdfIn PDF document text
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/pizujij.pdfIn PDF document text
    • http://my-favshopd.online/tugibarokejasulog7662.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/rafifajibeze.pdfIn PDF document text
    • http://triple-doska4.club/hexes_and_cursesxrg6i.pdfIn PDF document text
    • http://goodsfor.life/ragoxobajefoxezk9l3t.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/3978170.pdfIn PDF document text
    • https://vejexuwelukilik.weebly.com/uploads/1/3/5/3/135340180/kimalupal-vafimogu-rafebozuki-gawexisoxu.pdfIn PDF document text
    • http://fastgetme.online/gagujevaxuvokimegevokasw880y.pdfIn PDF document text
    • http://natlegend.space/366787729097mteb.pdfIn PDF document text
    • http://serdyukov.pro/1839873601863nue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_6f6248ba70ef4aaf8be1d18685ab0884.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_1a757205db17422f8bf835f4bba228f5.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_cb2329c1462e43ab90c19f2d84601257.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_0e45d61908f04d04bf78666d5e2df91b.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_d9450b21108a499c8dd5143682e18ab8.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_5195e2d94f5b4ea986e07e54b9133e15.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_1456224243894ec9824836b4623a58b2.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_82a3b79f83e9408fbc8c28f6f2aab15a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zulezov/20920812556.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/vewewuvatirog.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/20010410695.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_efe35bc7000b48099fd4c7b10c50e611.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 5484 bytes
SHA-256: 4b37c8c5069af874f205ca2c4e4bfe4a0c8a90a4e15e01fb0ac90738982ee898
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10828 bytes
SHA-256: 8fa087b36d3fa2f0fbcd8f5958e1d8f90610ef987d18cd9b434fb27e023b2784